netdev - [PATCH] sr9700: improve packet length sanity check

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Date:   Thu, 14 Jul 2022 10:21:34 -0300
From:   Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
To:     netdev@...r.kernel.org
Cc:     linux-usb@...r.kernel.org, oneukum@...e.com, grundler@...omium.org,
        pabeni@...hat.com, kuba@...nel.org, edumazet@...gle.com,
        davem@...emloft.net,
        Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Subject: [PATCH] sr9700: improve packet length sanity check

The packet format includes a 3 byte headers and a 4 byte CRC. Account for
that when checking the given length is not larger than the skb length.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@...onical.com>
Fixes: e9da0b56fe27 ("sr9700: sanity check for packet length")
---
 drivers/net/usb/sr9700.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/usb/sr9700.c b/drivers/net/usb/sr9700.c
index 5a53e63d33a6..09bb40ac6e09 100644
--- a/drivers/net/usb/sr9700.c
+++ b/drivers/net/usb/sr9700.c
@@ -413,7 +413,7 @@ static int sr9700_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
 		/* ignore the CRC length */
 		len = (skb->data[1] | (skb->data[2] << 8)) - 4;
 
-		if (len > ETH_FRAME_LEN || len > skb->len)
+		if (len > ETH_FRAME_LEN || len + SR_RX_OVERHEAD > skb->len)
 			return 0;
 
 		/* the last packet of current skb */
-- 
2.34.1